Educational math worksheet for practicing counting in tens, hundreds, and thousands with abacus and number pattern activities.

Problem Analysis and Solution

The worksheet involves counting in multiples of 10s, 100s, and 1000s, identifying patterns, and filling in missing numbers. Let's solve each section step by step.

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#### Section 1: Counting in 10s, 100s, and 1000s

Given: The abacus shows the number 4825.

1. a. 10 more than 4825 is:
- Adding 10 to 4825:
\[
4825 + 10 = 4835
\]
- Answer: 4835 (already filled in the image).

2. b. 100 less than 4825 is:
- Subtracting 100 from 4825:
\[
4825 - 100 = 4725
\]
- Answer: 4725.

3. c. 1000 more than 4825 is:
- Adding 1000 to 4825:
\[
4825 + 1000 = 5825
\]
- Answer: 5825.

---

#### Section 2: Identifying Patterns

We need to identify the pattern in each sequence and write the next three numbers.

1. First Sequence: 2347, 3347, 4347, ...
- Pattern: Each number increases by 1000.
- Next three numbers:
\[
4347 + 1000 = 5347
\]
\[
5347 + 1000 = 6347
\]
\[
6347 + 1000 = 7347
\]
- Answers: 5347, 6347, 7347 (already filled in the image).

2. Second Sequence: 8801, 8811, 8821, ...
- Pattern: Each number increases by 10.
- Next three numbers:
\[
8821 + 10 = 8831
\]
\[
8831 + 10 = 8841
\]
\[
8841 + 10 = 8851
\]
- Answers: 8831, 8841, 8851.

3. Third Sequence: 3451, 3351, 3251, ...
- Pattern: Each number decreases by 100.
- Next three numbers:
\[
3251 - 100 = 3151
\]
\[
3151 - 100 = 3051
\]
\[
3051 - 100 = 2951
\]
- Answers: 3151, 3051, 2951.

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#### Section 3: Writing Missing Numbers

We need to identify the pattern in each sequence and fill in the missing numbers.

1. First Sequence: 3861, 3761, ____, ____, ____, 3361
- Pattern: Each number decreases by 100.
- Missing numbers:
\[
3761 - 100 = 3661
\]
\[
3661 - 100 = 3561
\]
\[
3561 - 100 = 3461
\]
- Answers: 3661, 3561, 3461 (already filled in the image).

2. Second Sequence: 581, 591, ____, ____, ____, 631
- Pattern: Each number increases by 10.
- Missing numbers:
\[
591 + 10 = 601
\]
\[
601 + 10 = 611
\]
\[
611 + 10 = 621
\]
- Answers: 601, 611, 621.

3. Third Sequence: ____, 2111, ____, ____, 1711
- Pattern: Each number decreases by 100.
- Missing numbers:
\[
2111 + 100 = 2211
\]
\[
2111 - 100 = 2011
\]
\[
2011 - 100 = 1911
\]
- Answers: 2211, 2011, 1911.

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Final Answers

1. Section 1:
- b. 4725
- c. 5825

2. Section 2:
- Second Sequence: 8831, 8841, 8851
- Third Sequence: 3151, 3051, 2951

3. Section 3:
- Second Sequence: 601, 611, 621
- Third Sequence: 2211, 2011, 1911

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Boxed Final Answer

\[
\boxed{4725, 5825, 8831, 8841, 8851, 3151, 3051, 2951, 601, 611, 621, 2211, 2011, 1911}
\]